Rapid response – The homes are based on a foundation of rocks but require no imported materials. They can be constructed in 15 days for as little as $150.

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Work force – The NGO has a market-based approach to proliferating the Nubian vault homes. It has trained over 500 masons and hundreds more apprentices who can respond to public demand and train a new generation.

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Spreading the word – Around 20,000 people now live in Nubian vaults across five countries where the program is being implemented; Burkina Faso, Mali, Senegal, Benin and Ghana, with plans to expand into new countries.

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Climate control – The homes are well-suited to the local climate, retaining heat at night but remaining cool during the day.

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All purpose – The method is versatile enough to provide for a range of needs, such as this basic unit for a small family...

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Going up – ...As well as this two-story home for a family that needs more space.

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Luxury option – Nubian vaults can also be grand affairs with several rooms and levels.

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Public interest – The program also goes beyond homes to provide public and community buildings such as this literacy center.

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Town hall – This community building would be used to host public meetings and events.